As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT AIR RETURNED TO DFW ON ACCOUNT OF NUMBER ONE ENGINE OIL OUANTITY ISSUE. EMERGENCY DECLARED. MAINTENANCE FOUND OIL SCAVENGE LINE B-NUT LOOSE AT AFT HOT SECTION, 5 OCLOCK POSITION. TIGHTENED B-NUT IAW AMM 79-21-00 AND AMM 70-21-00. LEAK CHECK GOOD.